Condensed Consolidated Income Statements (Unaudited) (USD $) In Millions, except Share data in Thousands, unless otherwise specified	3 Months Ended					9 Months Ended
	Sep. 30, 2014	Mar. 31, 2014	Sep. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2014	Sep. 30, 2013
Income Statement [Abstract]
Revenues before provision for doubtful accounts	$ 9,978		$ 9,411			$ 29,619	$ 28,078
Provision for doubtful accounts	758		955			2,337	2,732
Revenues	9,220		8,456			27,282	25,346
Salaries and benefits	4,211		3,916			12,359	11,681
Supplies	1,539		1,457			4,603	4,406
Other operating expenses	1,688		1,564			4,977	4,594
Electronic health record incentive income	(32)		(75)			(97)	(166)
Equity in earnings of affiliates	(14)		(9)			(32)	(29)
Depreciation and amortization	460		443			1,361	1,292
Interest expense	427		458			1,314	1,392
Losses (gains) on sales of facilities	12		1			(20)	13
Losses on retirement of debt				17		226	17
Legal claim costs		78			175	78
Total expenses including equity in earnings of affiliates	8,291		7,755			24,769	23,200
Income before income taxes	929		701			2,513	2,146
Provision for income taxes	318		234			816	704
Net income	611		467			1,697	1,442
Net income attributable to noncontrolling interests	93		102			349	310
Net income attributable to HCA Holdings, Inc.	$ 518		$ 365			$ 1,348	$ 1,132
Per share data:
Basic earnings per share	$ 1.20		$ 0.82			$ 3.08	$ 2.54
Diluted earnings per share	$ 1.16		$ 0.79			$ 2.98	$ 2.44
Shares used in earnings per share calculations (in thousands):
Basic	432,617		447,329			437,832	446,125
Diluted	447,260		463,569			452,538	463,051